The DARKROOM COOKBOOK, Third Edition

Formulas 297
As with Kodak Rapid Selenium Toner, 1:9 will produce a color shift towards red while greater
dilutions, 1:19 and higher, will intensify the black areas of the print without altering the color.
The amount of dilution is paper dependent.
DuPont Toning System
FORMULA #166
DuPont 6-T
Toning System
This system of bleaches and toners can be mixed and matched to provide a variety of tones
from purplish sepia to brilliant yellow (Chapter 10: DuPont 6-T Toning System).
Varigam toning bleach 6B-1:
Water, 750.0 ml
Potassium ferricyanide, 22.0 g
Potassium bromide, 25.0 g
Water to make 1.0 liter
Varigam toning bleach 6B-2:
Water, 750.0 ml
Potassium ferricyanide, 22.0 g
Potassium iodide, 10.0 g
Water to make 1.0 liter
Varigam toning bleach 6B-3:
Water, 750.0 ml
Potassium ferricyanide, 22.0 g
Sodium chloride, 35.0 g
Nitric acid, 15.0 ml
Water to make 1.0 liter
Prints should be developed for 1½ minutes and fi xed in a non-hardening fi xing bath.
Thoroughly wash the prints then bleach in one of the above bleaching baths for twice the
time necessary to completely convert the black image. Then wash again until the image is
free from the yellow bleach color.
The bleached print is placed in one of the following toning baths and left until toning is
complete.
Varigam toner 6T-1:
Water, 750.0 ml
Thiourea (thiocarbamide), 3.0 g
Sodium hydroxide, 6.0 g
Water to make 1.0 liter